Vulnerability · Published Mar 31, 2026 · Assigned by GitHub_M
CVE-2026-32726SciTokens C++: Sibling-Path Authorization Bypass
High 8.1
In plain English
A high-severity incorrect authorization in scitokens-cpp from scitokens. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
SciTokens C++ is a minimal library for creating and using SciTokens from C or C++. Prior to version 1.4.1, scitokens-cpp is vulnerable to an authorization bypass in path-based scope validation. The enforcer used a simple string-prefix comparison when checking whether a requested resource path was covered by a token's authorized scope path. Because the check did not require a path-segment boundary, a token scoped to one path could incorrectly authorize access to sibling paths that merely started with the same prefix. This issue has been patched in version 1.4.1.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | scitokens-cpp | no fix listed | DEBIAN-CVE-2026-32726 |
| Debian:13 | scitokens-cpp | no fix listed | DEBIAN-CVE-2026-32726 |
| Debian:14 | scitokens-cpp | 1.4.1-1 | DEBIAN-CVE-2026-32726 |
| Ubuntu:22.04:LTS | scitokens-cpp | no fix listed | UBUNTU-CVE-2026-32726 |
| Ubuntu:24.04:LTS | scitokens-cpp | no fix listed | UBUNTU-CVE-2026-32726 |
| Ubuntu:25.10 | scitokens-cpp | no fix listed | UBUNTU-CVE-2026-32726 |
| Ubuntu:26.04:LTS | scitokens-cpp | no fix listed | UBUNTU-CVE-2026-32726 |
| Ubuntu:26.10 | scitokens-cpp | no fix listed | UBUNTU-CVE-2026-32726 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| scitokens | scitokens-cpp | < 1.4.1 |
Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N